Drawings of Prefabricated Building Components

Drawings of prefabricated building components cover the design and drawing essentials for various types of components. Below are common prefabricated components and their drawing-related information:

1. Prefabricated Exterior Wall Components Design institutes often use BIM technology to achieve the output of 3D modeling to 2D drawings. The same component is divided into simplified and detailed components: simplified components are used for conventional plan and elevation drawings; detailed components include fine details such as bolt sleeves and air-conditioning reserved holes, enabling the generation of detailed elevation and section drawings. For example, a prefabricated sandwich insulation exterior wall needs to indicate key parameters such as the thickness of the insulation layer and the positions of connectors.

2. Prefabricated Floor Slabs These include prefabricated solid slabs, hollow slabs, composite slabs, and balcony slabs. A prefabricated composite slab is composed of a 60-80mm thick prefabricated layer and a cast-in-place layer of over 70mm. The drawings need to specify the arrangement of truss reinforcement and the interface treatment between the prefabricated and cast-in-place layers. Its advantage lies in reducing the workload of on-site formwork support and saving labor and materials.

3. Prefabricated Beams Common types include solid beams, composite beams, and U-shaped beams. A prefabricated composite beam usually has a rectangular or T-shaped cross-section. The drawings need to indicate the boundary between the prefabricated and cast-in-place parts and the reinforcement connection method (such as sleeve grouting connection). In an assembled monolithic frame structure, a rectangular-section prefabricated beam needs to have cast-in-place concrete after installation to form a whole.

4. Prefabricated Walls These are divided into solid shear walls, hollow walls, composite shear walls, and non-load-bearing walls. A prefabricated solid shear wall includes reinforced steel sleeve shear walls and grout-anchored shear walls, etc. The drawings need to indicate the positions of sleeves and the sizes of grout-anchored holes; a prefabricated sandwich insulation exterior wall needs to show the thickness of the inner and outer leaf wall panels, the insulation layer material, and the layout of connectors.

5. Prefabricated Columns These include solid and hollow columns, mostly with rectangular cross-sections. The drawings need to clearly indicate the positions of full grouting sleeve connections, the performance requirements of grouting materials, and construction precautions. For example, the connection between the column base and the foundation needs to indicate the grouting compactness inspection requirements.

6. Prefabricated Stairs Divided into stair flights and landings, the drawings need to indicate the height and width of steps, the positions of anti-slip strips, and the specifications of embedded parts. The connection method between the prefabricated stairs and the main structure (such as bolt fixation) needs to be detailed in the drawings.

7. Complex Special-Shaped Components Such as prefabricated bay windows, corner exterior walls, and integrated kitchen and bathroom units, the drawings need to combine 3D models with 2D detailed drawings, indicating the dimensions of special-shaped parts, the positions of embedded pipelines, and the installation sequence. For example, a prefabricated air-conditioning panel needs to clearly indicate the drainage slope and the connection nodes with the main structure.

The drawing of prefabricated components needs to take into account both standardized and personalized requirements to ensure construction feasibility. The detailed drawings should include key information such as material properties, processing accuracy, and installation error control to provide technical basis for factory production and on-site assembly.